EP0883896B1 - High-pressure discharge lamp - Google Patents
High-pressure discharge lamp Download PDFInfo
- Publication number
- EP0883896B1 EP0883896B1 EP97923298A EP97923298A EP0883896B1 EP 0883896 B1 EP0883896 B1 EP 0883896B1 EP 97923298 A EP97923298 A EP 97923298A EP 97923298 A EP97923298 A EP 97923298A EP 0883896 B1 EP0883896 B1 EP 0883896B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamp
- enhancer
- discharge vessel
- wall
- discharge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/34—Double-wall vessels or containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
Definitions
- the invention relates to a high-pressure discharge lamp with a discharge vessel which is enclosed with intervening space by an outer bulb provided with a lamp cap, which lamp also comprises a UV-enhancer provided with a wall and an internal electrode and arranged in the space between the outer bulb and the discharge vessel.
- a lamp of the kind mentioned in the opening paragraph is known from EP-A-0 313 027.
- the known lamp is a high-pressure discharge lamp, more in particular a metal halide lamp.
- Such a lamp is suitable for various applications such as general interior lighting, general exterior lighting, video illumination, etc.
- the discharge vessel of the known lamp is made of quartz glass. It is alternatively possible, however, for this vessel to be made of ceramic material. Ceramic material in the present description and claims is understood to be a densely sintered polycrystalline metal oxide such as, for example, Al 2 O 3 or YAG and densely sintered polycrystalline metal nitride such as, for example, A/N.
- a known problem of this type of lamp is the comparatively wide spread in ignition time. This points to a shortage of free electrons during lamp ignition.
- the addition of a small quantity of 85 Kr in the discharge vessel can supplement such a shortage.
- a disadvantage of this, however, is that 85 Kr is radioactive.
- Efforts have been made to avoid this through the use of a UV-enhancer, which is a small UV discharge tube positioned adjacent the discharge vessel and acting as a UV source.
- the UV-enhancer in the known lamp is formed by a UV-transmitting quartz tube. Upon breakdown, the UV-enhancer will generate said UV-radiation. The influence of this UV-radiation leads to the production of free electrons in the discharge vessel, which in their turn strongly promote lamp ignition.
- the invention has for its object to provide a measure by which the above problem is counteracted.
- a lamp of the kind mentioned in the opening paragraph is for this purpose characterized in that the wall of the UV-enhancer is made from ceramic material.
- a further advantage of the UV-enhancer according to the invention is the very good heat resistance of ceramic materials. This renders it possible to position the UV-enhancer at a very small distance from the discharge vessel.
- the good heat resistance of the UV-enhancer according to the invention also allows for its use in a lamp having a ceramic discharge vessel.
- the UV-enhancer has a wall which is made from densely sintered polycrystalline Al 2 O 3 .
- the fact that this is widely used as a wall material for high-pressure discharge lamps has the major practical advantage that an existing technology for ceramic discharge vessels can be utilized. A very high degree of miniaturization is possible here.
- the UV-enhancer preferably has a rare gas filling. Suitable is inter alia Ne. Ar was found to be particularly suitable as a filling.
- a pressure is preferably chosen for the filling which accompanies a minimum breakdown voltage. This filling pressure may be readily ascertained experimentally. A fair approximation can be realized by means of the Paschen curve. A mixture of rare gases in the form of a Penning mixture is also suitable.
- the UV-enhancer may be constructed as a discharge vessel having two internal electrodes between which the discharge takes place.
- the UV-enhancer is provided with one internal electrode and is mounted in the space surrounded by the outer bulb in such a manner relative to a current supply conductor to the discharge vessel that a capacitive coupling between the UV-enhancer and the current supply conductor is achieved.
- Fig. 1 shows a high-pressure metal halide lamp with a discharge vessel 1 which is enclosed with intervening space 2 by an outer bulb 3 which has a lamp cap 4.
- the lamp comprises a UV-enhancer 5 in the space between the outer bulb and the discharge vessel.
- a lead-through conductor 70 of the UV-enhancer is connected to a current supply conductor 9 which connects an internal electrode 11 of the discharge vessel to a contact point of the lamp cap 4.
- a further current supply conductor 8 forms an electrical connection between an internal electrode 12 of the discharge vessel 1 and a further contact point of the lamp cap 4.
- the UV-enhancer is so positioned relative to the current supply conductor 8 that a capacitive coupling is achieved.
- the UV-enhancer shown in more detail in Fig. 2 has a wall 6 and an internal electrode 7.
- the wall 6 of the UV-enhancer 5 is made of ceramic material here.
- the wall is made from densely sintered polycrystalline Al 2 O 3 .
- the internal electrode 7 of the UV-enhancer is connected to a lead-through conductor 70 which is passed through the wall of the UV-enhancer via a gastight lead-through passage 71.
- the lead-through conductor is an Nb-rod in a practical embodiment.
- a W-rod is used as the electrode. It is alternatively possible to have the Nb-rod itself act as the electrode.
- the UV-enhancer has an external length of 12 mm, an external diameter of 2 mm, an internal diameter of 0.66 mm, and a greatest internal length of 9 mm.
- the W-rod of 2 mm length and 170 ⁇ m diameter is welded to an Nb lead-through conductor of 620 ⁇ m diameter.
- the UV-enhancer contains Ar with a filling pressure of 170 mbar.
- the filling pressure lies between 50 mbar and 300 mbar.
- commercially available UV-enhancers with a quartz or quartz-glass wall have an external length of 25 mm and a diameter of 5 mm.
- the lamps were 39 W CDM lamps, make Philips, connected to a supply voltage source of 220 V, 50 Hz via a stabilizer ballast provided with an igniter circuit. These lamps have ceramic discharge vessels with fillings comprising metal halide. The ceramic material of the discharge vessel reaches a temperature of between 800 °C and 1000 °C during lamp operation.
- the igniter circuit comprises a starter of the Sn 57 type, make Philips. This starter is widely used for igniting high-pressure discharge lamps and supplies ignition pulses with a maximum value of 2.3 kV and a pulse width of 10 ⁇ s.
- a number of lamps from the series was provided with a ceramic UV-enhancer of the embodiment described above.
- Another group of the lamps was provided with a ceramic UV-enhancer with a filling of Ar and 0.5 mg Hg.
- lamps without UV-enhancer and lamps comprising UV-enhancers according to the prior art were subjected to the same ignition test.
- the UV-enhancers are capacitively coupled to one of the current supply conductors of the lamp.
- the test results show that the lamps with ceramic UV-enhancers all ignite within a few tenths of a second. This means that both breakdown in the UV-enhancer and subsequent breakdown in the discharge vessel take place within a few tenths of a second.
- the lamps without UV-enhancers do not ignite, while only some of the lamps having UV-enhancers according to the prior art ignite, and indeed with major delays of up to several seconds.
- a similar test with metal halide lamps having quartz glass discharge vessels and a power rating of 70 W gave a similar result.
- the UV-enhancer should be positioned at a very small distance from the discharge vessel to promote a fast and reliable ignition of the lamp according to the invention. This is possible in the manner as shown in Fig. 1, for example, where the UV-enhancer is positioned parallel to and at a distance d from the discharge vessel. Preferably, the distance d in such an arrangement is at most 10 mm.
- Another favorable positioning of the UV-enhancer is behind an electrode adjacent the lead-through conductor at an angle (of e.g. 45°) to the longitudinal axis of the discharge vessel, as depicted diagrammatically in Fig. 3. Positioning the UV-enhancer at such a small distance from the discharge vessel requires a very good heat resistance of the wall of the UV-enhancer.
- the wall temperature of the UV-enhancer will lie above 600 °C for prolonged periods during lamp operation, in particular if the lamp has a ceramic discharge vessel.
Landscapes
- Discharge Lamps And Accessories Thereof (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
A further advantage of the UV-enhancer according to the invention is the very good heat resistance of ceramic materials. This renders it possible to position the UV-enhancer at a very small distance from the discharge vessel. The good heat resistance of the UV-enhancer according to the invention also allows for its use in a lamp having a ceramic discharge vessel.
The UV-enhancer may be constructed as a discharge vessel having two internal electrodes between which the discharge takes place. Preferably, the UV-enhancer is provided with one internal electrode and is mounted in the space surrounded by the outer bulb in such a manner relative to a current supply conductor to the discharge vessel that a capacitive coupling between the UV-enhancer and the current supply conductor is achieved. An important advantage is the strongly simplified construction of the UV-enhancer made possible thereby, which in its turn facilitates further miniaturization.
In a practical realization, the UV-enhancer has an external length of 12 mm, an external diameter of 2 mm, an internal diameter of 0.66 mm, and a greatest internal length of 9 mm. The W-rod of 2 mm length and 170 µm diameter is welded to an Nb lead-through conductor of 620 µm diameter.
The UV-enhancer contains Ar with a filling pressure of 170 mbar. Preferably, the filling pressure lies between 50 mbar and 300 mbar.
For comparison, it should be noted that commercially available UV-enhancers with a quartz or quartz-glass wall have an external length of 25 mm and a diameter of 5 mm.
A number of lamps from the series was provided with a ceramic UV-enhancer of the embodiment described above. Another group of the lamps was provided with a ceramic UV-enhancer with a filling of Ar and 0.5 mg Hg. For comparison, lamps without UV-enhancer and lamps comprising UV-enhancers according to the prior art were subjected to the same ignition test.
The UV-enhancers are capacitively coupled to one of the current supply conductors of the lamp.
The test results show that the lamps with ceramic UV-enhancers all ignite within a few tenths of a second. This means that both breakdown in the UV-enhancer and subsequent breakdown in the discharge vessel take place within a few tenths of a second. The lamps without UV-enhancers do not ignite, while only some of the lamps having UV-enhancers according to the prior art ignite, and indeed with major delays of up to several seconds. A similar test with metal halide lamps having quartz glass discharge vessels and a power rating of 70 W gave a similar result.
The UV-enhancer should be positioned at a very small distance from the discharge vessel to promote a fast and reliable ignition of the lamp according to the invention. This is possible in the manner as shown in Fig. 1, for example, where the UV-enhancer is positioned parallel to and at a distance d from the discharge vessel. Preferably, the distance d in such an arrangement is at most 10 mm. Another favorable positioning of the UV-enhancer is behind an electrode adjacent the lead-through conductor at an angle (of e.g. 45°) to the longitudinal axis of the discharge vessel, as depicted diagrammatically in Fig. 3. Positioning the UV-enhancer at such a small distance from the discharge vessel requires a very good heat resistance of the wall of the UV-enhancer. The wall temperature of the UV-enhancer will lie above 600 °C for prolonged periods during lamp operation, in particular if the lamp has a ceramic discharge vessel.
Claims (5)
- A high-pressure discharge lamp with a discharge vessel (1) which is enclosed with intervening space (2) by an outer bulb (3) provided with a lamp cap (4), which lamp also comprises a UV-enhancer (5) provided with a wall (6) and an internal electrode (7) and arranged in the space between the outer bulb and the discharge vessel, characterized in that the wall of the UV-enhancer is made from ceramic material, being a densely sintered polycrystalline metal oxide or nitride.
- A lamp as claimed in Claim 1, characterized in that the wall of the UV-enhancer is made from densely sintered polycrystalline Al2O3.
- A lamp as claimed in Claim 1 or 2, characterized in that the UV-enhancer has a rare gas filling.
- A lamp as claimed in Claim 3, characterized in that the rare gas filling comprises Ar.
- A lamp as claimed in Claim 3 or 4, characterized in that the filling pressure of the rare gas filling lies between 50 mbar and 300 mbar.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97923298A EP0883896B1 (en) | 1996-07-11 | 1997-06-12 | High-pressure discharge lamp |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96201951 | 1996-07-11 | ||
EP96201951 | 1996-07-11 | ||
PCT/IB1997/000683 WO1998002902A1 (en) | 1996-07-11 | 1997-06-12 | High-pressure discharge lamp |
EP97923298A EP0883896B1 (en) | 1996-07-11 | 1997-06-12 | High-pressure discharge lamp |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0883896A1 EP0883896A1 (en) | 1998-12-16 |
EP0883896B1 true EP0883896B1 (en) | 2002-12-18 |
Family
ID=8224173
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97923298A Expired - Lifetime EP0883896B1 (en) | 1996-07-11 | 1997-06-12 | High-pressure discharge lamp |
Country Status (9)
Country | Link |
---|---|
US (1) | US5811933A (en) |
EP (1) | EP0883896B1 (en) |
JP (1) | JP4593693B2 (en) |
KR (1) | KR100474158B1 (en) |
CN (1) | CN1104030C (en) |
DE (1) | DE69717972T2 (en) |
ID (1) | ID18437A (en) |
TW (1) | TW338172B (en) |
WO (1) | WO1998002902A1 (en) |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5942840A (en) * | 1997-04-22 | 1999-08-24 | Philips Electronics North America Corp. | High-pressure discharge lamp with sealed UV-enhancer |
US5990599A (en) * | 1997-12-18 | 1999-11-23 | Philips Electronics North America Corp. | High-pressure discharge lamp having UV radiation source for enhancing ignition |
WO1999048133A1 (en) * | 1998-03-19 | 1999-09-23 | Koninklijke Philips Electronics N.V. | Unit comprising a short-arc discharge lamp with a starting antenna |
CN1151540C (en) * | 1999-06-16 | 2004-05-26 | 皇家菲利浦电子有限公司 | Metal halide lamp |
US6087784A (en) * | 1999-06-22 | 2000-07-11 | Corning Incorporated | Glow discharge lamp |
US6172462B1 (en) | 1999-11-15 | 2001-01-09 | Philips Electronics North America Corp. | Ceramic metal halide lamp with integral UV-enhancer |
DE60033299T2 (en) | 1999-12-14 | 2007-08-30 | Koninklijke Philips Electronics N.V. | HIGH PRESSURE DISCHARGE LAMP |
JP4525886B2 (en) * | 2001-02-19 | 2010-08-18 | 東芝ライテック株式会社 | High pressure discharge lamp, high pressure discharge lamp lighting device and lighting device |
US6509696B2 (en) * | 2001-03-22 | 2003-01-21 | Koninklijke Philips Electronics N.V. | Method and system for driving a capacitively coupled fluorescent lamp |
DE10127974A1 (en) * | 2001-06-08 | 2002-12-12 | Philips Corp Intellectual Pty | Gas discharge lamp has a coupling structure consisting of a metallic element with a dielectric layer surrounding the element in the region of a discharge chamber |
US20030025455A1 (en) * | 2001-07-31 | 2003-02-06 | Alderman John C. | Ceramic HID lamp with special frame for stabilizing the arc |
US6806646B2 (en) * | 2001-09-24 | 2004-10-19 | Osram Sylvania Inc. | UV enhancer for a metal halide lamp |
US7132800B2 (en) * | 2001-11-15 | 2006-11-07 | Koninklijke Philips Electronics, N.V. | High-pressure discharge lamp |
JP3528836B2 (en) * | 2002-01-09 | 2004-05-24 | ウシオ電機株式会社 | Discharge lamp |
JP2007507062A (en) * | 2003-09-17 | 2007-03-22 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Gas discharge lamp |
CN2678122Y (en) * | 2003-11-28 | 2005-02-09 | 柴国生 | Single-ended high gas pressure discharge lamp with holder |
TWI280451B (en) * | 2005-03-11 | 2007-05-01 | Benq Corp | Projection device and discharge lamp thereof |
CN200965865Y (en) * | 2006-10-13 | 2007-10-24 | 北京恒伟宗泰科技发展有限公司 | Multi-light source high-strength gas discharge lamp tube |
JP4760945B2 (en) | 2009-04-17 | 2011-08-31 | 岩崎電気株式会社 | Light source device |
JP5278211B2 (en) * | 2009-07-14 | 2013-09-04 | 岩崎電気株式会社 | Discharge lamp |
DE102010031280A1 (en) | 2010-07-13 | 2012-01-19 | Osram Gesellschaft mit beschränkter Haftung | High pressure discharge lamp with ignition aid |
DE102010038403A1 (en) | 2010-07-26 | 2012-01-26 | Osram Gesellschaft mit beschränkter Haftung | High pressure discharge lamp with ignition aid |
DE202010011029U1 (en) | 2010-08-09 | 2010-10-21 | Osram Gesellschaft mit beschränkter Haftung | High pressure discharge lamp with ignition aid |
CN102034671A (en) * | 2010-10-09 | 2011-04-27 | 上海亚明灯泡厂有限公司 | UV bulb structure of metal halide lamp and manufacturing method thereof |
DE202010016865U1 (en) | 2010-12-21 | 2011-03-10 | Osram Gesellschaft mit beschränkter Haftung | High pressure discharge lamp with ignition aid |
DE102010064040A1 (en) | 2010-12-23 | 2012-06-28 | Osram Ag | High pressure discharge lamp with ignition aid |
DE112011104885A5 (en) | 2011-02-14 | 2013-11-07 | Osram Gmbh | High pressure discharge lamp with halogen holder ignition aid |
EP2673796B1 (en) | 2011-07-28 | 2015-03-04 | OSRAM GmbH | High-pressure discharge lamp having an ignition aid |
US9064682B2 (en) | 2011-12-02 | 2015-06-23 | Koninklijke Philips N.V. | UV-enhancer arrangement for use in a high-pressure gas discharge lamp |
CN104508793A (en) | 2012-08-03 | 2015-04-08 | 皇家飞利浦有限公司 | High pressure discharge lamp with a UV-enhancer, and manufacture method therefor |
CN104637779B (en) * | 2015-01-31 | 2017-03-15 | 深圳市美吉星集成科技有限公司 | The HED lamps of the built-in single electrode ultraviolet discharge pipe of bulb |
CN108682603B (en) * | 2018-06-12 | 2020-06-12 | 浙江新光阳照明股份有限公司 | Method for manufacturing ceramic auxiliary starter of environment-friendly metal halide lamp |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0313027A2 (en) * | 1987-10-22 | 1989-04-26 | Gte Products Corporation | Arc discharge lamp with ultraviolet radiation starting source |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD201107A1 (en) * | 1981-11-30 | 1983-07-06 | Gerhard Babucke | UV CADMIUM LOW PRESSURE SPRAYER FOR IRRADIATOR PURPOSES |
US4987344A (en) * | 1990-02-05 | 1991-01-22 | Gte Products Corporation | Arc discharge lamp with internal starter |
US5323091A (en) * | 1992-11-04 | 1994-06-21 | Gte Products Corporation | Starting source for arc discharge lamps |
US5323087A (en) * | 1992-11-20 | 1994-06-21 | Gte Products Corporation | Ultraviolet radiation starting source and lamp containing same |
US5646484A (en) * | 1994-11-02 | 1997-07-08 | Litebeams, Inc. | High reliability incandescent portable illumination system |
US5550421A (en) * | 1994-12-06 | 1996-08-27 | Osram Sylvania Inc. | Discharge lamp with enhanced performance and improved containment |
US5680000A (en) * | 1995-11-07 | 1997-10-21 | Osram Sylvania Inc. | Reflective metal heat shield for metal halide lamps |
-
1997
- 1997-02-07 US US08/795,164 patent/US5811933A/en not_active Expired - Lifetime
- 1997-02-12 TW TW086101548A patent/TW338172B/en active
- 1997-06-12 WO PCT/IB1997/000683 patent/WO1998002902A1/en active IP Right Grant
- 1997-06-12 JP JP50578398A patent/JP4593693B2/en not_active Expired - Lifetime
- 1997-06-12 DE DE69717972T patent/DE69717972T2/en not_active Expired - Lifetime
- 1997-06-12 KR KR10-1998-0701798A patent/KR100474158B1/en not_active IP Right Cessation
- 1997-06-12 CN CN97190879A patent/CN1104030C/en not_active Expired - Lifetime
- 1997-06-12 EP EP97923298A patent/EP0883896B1/en not_active Expired - Lifetime
- 1997-07-07 ID IDP972353A patent/ID18437A/en unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0313027A2 (en) * | 1987-10-22 | 1989-04-26 | Gte Products Corporation | Arc discharge lamp with ultraviolet radiation starting source |
Also Published As
Publication number | Publication date |
---|---|
JPH11513182A (en) | 1999-11-09 |
ID18437A (en) | 1998-04-09 |
KR19990044549A (en) | 1999-06-25 |
WO1998002902A1 (en) | 1998-01-22 |
DE69717972T2 (en) | 2003-08-28 |
CN1197540A (en) | 1998-10-28 |
JP4593693B2 (en) | 2010-12-08 |
CN1104030C (en) | 2003-03-26 |
DE69717972D1 (en) | 2003-01-30 |
TW338172B (en) | 1998-08-11 |
US5811933A (en) | 1998-09-22 |
KR100474158B1 (en) | 2005-05-16 |
EP0883896A1 (en) | 1998-12-16 |
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